Noteworthy, ethanol yields on sugar for S. cerevisiae strains under
these experimental conditions were quite below normal values under
anaerobic conditions (about 0.45 g/g). This was only partly explained
by alcohol stripping(datanotshown),and indicates a significant contribution of respiratory metabolism. However, the acetic acid yield for both S.cerevisiaestrains was extremely highundertheseaerated conditions (Table 2), and the resulting increase in volatile acidity would preclude any practical application of the respiratory capacity of these